riscv: accept dual-owner bitmanip instructions with either extension

[carlosqwqqwq]

Summary

The first ensure_additional_extension(ZBB) call raises the illegal-instruction exception before the Zbkb alternative is tested. Use a non-raising any-extension check for the dual-owner instruction family, preserving the illegal-instruction path when neither extension is enabled.

Validation

• All ten dual-owner instructions retire on the Zbkb-only profile after the fix; legal controls remain valid.
• QEMU and native RISC-V hardware references are consistent.
• The patch changes the shared gate helper and its call sites.

Fixes renode/renode#959